I assume you have checked for apps running in background, that may generate heat?
I have various greenery, battery monitor, CPU usage monitor apps but off the top of my head I can't say which work on fire with or without Google services and which are pure android only.
It is more likely that it has taken amazon a few generations to figure out how to reduce heat and also slim the design.
One heat culprit on some devices is the wifi regularly checking all ssid to see if it is still on strongest one. Figuring out how to disable such behaviour can help
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